Reading the posts on this subject, I thought I could add something......

1. It's always better if you don't have to hack a vintage TV to inject a video signal IMHO.

2. Older 10 channel tuners often won't tune channels 0 or 1 from a modulator in, say, a VCR. You may, or may not, be able to tune the CH1 slug in a turret tuner to the newer frequency.

3. Older TVs often have relatively poor sound channel performance when used on more recent standards. A few years prior to the introduction of colour, the transmitted sound carrier level was reduced with respect to the vision carrier. My AWA 209C is a marginal performer in this regard.

4. "Caption buzz" heard when using VCR-grade modulators is caused by the vision carrier being reduced to 0% on peak whites, when the video signal is not clamped to a reference. This "punches holes" in the sound carrier.

I use a couple of Kingray modulators that I got from a friend in the antenna system business. Analogue modulators are being stripped from commercial MATV systems as they are upgraded. The Kingray modulators are impressively well engineered and really do the job properly - no caption buzz on my AWA 209C and excellent picture quality. And you can set them to any VHF channel.

If you don't have a friend in the antenna business, it looks like Radio Parts still has some stock of this (now obsolete) product. I found this link:

http://www.radioparts.com.au/product/00760712/md100vs-vhf-audio-video-modulator-av-modulator-kingray#.VoSoFV5e3ao

Hope this helps.......

The good news is that there will be a slow, steady supply of these commercial grade modulators for a few years yet. The hospital I work at has 25 Ikuzi mods in service for the Foxtel channels and has no immediate plans to shift to digital. There's another several dozen hospitals in the same boat.

Yes the build quality on Kingray stuff is quite remarkable though the original RRP did indicate this somewhat.

Unfortunately the MD100s that were decommissioned from the mine site camp where I work were the UHF version and unsuitable for my needs.